Grinding apparatus



Oct. 18, 1932- c. SHIPPY ET AL 1,883,016

GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 1 Oct. 18, 1932.c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 2gwuemto'ut attouwqx Ju m Oct. 18, 1932. L. c. SHIPPY ET AL GRINDINGAPPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 3 N w g glwwmom.

1932- L. c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11Sheets-Sheet 4 Oct. '18, 1932. c. SHIPPY ETAL GRINDING APPARATUS FiledAug. 26, 1929' 11 Sheets-Sheet 5 c'lmmmm.

Oct. 18, 1932. c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11Sheets-Sheet 6 Oct. 18, 1932; L. c. SHlPPY ETAL GRINDING APPARATUS FiledAug. 26, 1929 11 Sheets-Sheet 7 I glwoe'ntou I Z5? Oct. 18, L c. S P ETAL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 8 Oct. 18,1932. L. c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11Sheets-Sheet 9 Oct. 18, 1932. CQSHIPPY ET AL GRINDING APPARATUS FiledAug. 26, 1929 11 Sheets-Sheet 10 2,] nvwn low Oct. 18, 1932. c. SHIPPYET AL GRINDING APPARATUS 1'1 Sheets-Sheet 11 Filed Aug. 26, 1929Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE LEO C. SHIPPY, OFANDERSON, AND LOUIS C. GOAD, F MUNCIE, INDIANA, ASSIGNORS TO DELCO-REMYCORPORATION, OF ANDERSON, INDIANA, A CORPORATION OF DELAWARE GRINDINGAPPARATUS Application filed August 26, 1929. SerialNo. 388,894.

This invention relates to apparatus'for shaping the contour of a bodypreferably by grinding and is particularly adapted for accuratelyshaping a rotary plate cam.

The present invention provides a novel method and apparatus by whichplate cams may be manufactured at relatively low cost. This novel methodcomprises rotating the cam blank upon its axis while at the same timesubjecting its periphery to the action of a grinding wheel which rotateson an axis transverse to the axis of the cam blank and at the same timemoving the grinding wheel bodily while rotatin the cam blank. This novelmethod comprises subjecting the camming periphery of the cam blank tothe action of a grinding wheel while the cam is mounted upon a su portproviding for rotation of the cam b ank upon its own axis. While thegrindin wheel is operating upon the periphery of t e blank the blank isrotated and at the same time the wheel is bodily moved in a manner suchthat the desired periphery or contour will be generated. The grindingwheel is mounted preferably upon an axis transverse to the axis ofrotation of the cam blank support and is provided with a plane endsurface which engages the blank.

Further objects and advantages of the present invention will be apparentfrom the accompanying drawings whlch show a machine embodying thepresent invention and adapted particularly for forming the desiredcontour on a plate cam used in mechanism for automatically controllingin accordance with speed, the ignition timer of an internal combustionengine.

In the drawings:

Fig. 1 is a full scale fragmentary plan view showing a cam blank andsupport therefor and two grinding wheels which simultaneousl y shape twocamming surfaces.

Fig. 2 is a fragmentary cross sectional view taken on the line 22 ofFig. 1. a

Fig. 3 is a fragmentary plan view of the machine drawn to a smallerscale than Figs. 1 and 2.

Figs. 4 an 5 taken together constitute a longitudinal sectional viewtaken on the line 4-4 of Fig. 3.

Figs. 6 and 7 taken together constitute a cross sectional view takenprincipally on the line 66 of Fig. 3.

Fig. 8 is a cross sectional view taken principally on the line 8-8 ofFig. 3.

-Fig. 9 is a cross sectional view taken principally on the line 99 ofFig. 3.

Fig. 10 is a sectional View ta (en principally on the line 10-10 of Fig.9.

Fig. 11 is a sectional view on the line 11-11 of Fig. 10.

Fig. 12 is a sectional view taken principally on the line 12--12 of Fig.3.

Fig. 13 is a sectional view on the line 13-13 of Fig. 17.

Figs. 14 and 15 are perspective views of friction clutch members shownin Fig. 17.

Fig. 16 is a sectional view on the line 16-16 of Fig. 7 and is drawn toa lar er scale.

Fig. 17 is a sectional view ta en principally on the line 17 17 of Fig.16.

Referring to Figs. 1 and 2 the work upon which this machine isparticularly ada ted to operate comprises a plate or cam blan 20 havmgcamming arms 21 and 21a and attached to a tubular member 22 providing ani nition timer cam 23 of the type usually ound in ignition timers forinternal combustion engines. One form of such ignition timer is shown inthe copending application of C. HrICllldl, Serial Number 80,714 filedJanuary 12, 1926.

This application discloses engine speed responsive means for'controllingthe angular relation between the ignition timer cam and the enginedriven shaft which operates it. This speed responsive means includesweight members which move in response to centrifugal force and cooperatewith members corresponding to the plate arm-3 21. For purposes ofunderstanding the present invention it is sufiicient to say that it isdesirable that each arm 21 be provided with a camming edge surfacelocated between points 24 and 25, the surface being designated by thenumeral 26 on arm 21, and 26a on arm 21a. The surf aces 26 and 260. areengaged respectively by the plane end faces 27 and 27a respectively ofgrinding wheels 28 and 28a. Wheels 28 and 28a are mounted for rotationupon axes ww and y-g respectively. The work or cam blank 20 is mountedto rotate upon its own axis designated ez in Fig. 2 and in a planecommon to the axes w-a; and y-y. The grinding wheel 28 is mounted forbodily movement alon its axis w-w and the wheel 28a is mounted forbodily movement along the axis yy. While the blank 20 is moved in acounterclockwise direction so that its arm 21 moves into the position21' and its arm 21a moves into the position 21'a the grinding wheels 28and 28a will have moved respectively into the positions 28' and 28'a.The point 24 on the cam contour 26 will first be engaged at point 24' bythe end face of grinding wheel 28 which at that time is located in theposition indicated by numeral 27 Likewise, the cam contour 26a of arm21a after having been located in the position 26a will first be engagedat 24'a by the end face of grinding wheel 28a when located in theposition 27a. While the blank 20 is being rotated still further in acounterclockwise direction the grinding wheels will be moved bodilyalong their axes toward their original positlon in such a manner thatthe point of engagement between each of .the cam contours 26 and 26awill move respectively from the point 24 to the point 25 of cam arm 21and from the point 24a to the point 25a of cam arm 21a. The rate ofaxial movement of each grinding wheel away from the axis of rotation ofthe cam blank is so related to the rate of turning movement of the camblank that the desired contour of surfaces 26 and 26a will be generatedand both the surfaces will bear the same relation to the ignitioninterrupter cam 23.

The cam blank 20 is made to rotate upon its own axis by mounting it upona pilot rod 30 adapted to fit closely within the tubular part 22 andmounted to rotate upon the axis 2-2 by connecting it coaxially with ashaft 31 also rotatable upon the axis z-2 and journalled within rollerbearings 32 and 33 supported by the cross member 34 which connects sideframe members 35 and 36 shown more particularly in Figs. 8 and 9. Asshown in Figs. p

4 and 5 and 6 and 7 the side frame members 35 and 36 are joined by aleft end frame member 37 and by right end frame member 38. These membersare closed by cover plates 39 and 40 respectively. The shaft 31 isprovided centrally with a taper bore 41 which receives the conical shank42 of the locating rod 30. The rod 30 is provided with a threadedportion 43 for receiving a suitable tool by which the rod 30 may beremoved from the shaft 31.

The blank 20 is maintained in the plane common to the axes of thegrinding wheels by causing the arms 21 and 21a to rest upon supportingposts 44 and 44a respectively, ex-

tending from an inverted cup-shaped hub 45 which fits with a tubular hub46 of a circular plate 47 to which a master cam 48 is secured by screws49. Each of the posts 44 or 44a is provided with a recess 44' or 44'awhich receives a portion of arms 21 and 21a respectively. Hence, theblank 20 is prevented from rotatin clockwise while being engaged by thegrinding wheels. As explained later the cam 48 controls the axialmovements of the grinding wheels with relation to the rotary movementsof the cam blank 20. Hence, it is necessary that the cam blanks supportbe adjustably secured to the plate 47 carrying the master cam 48. Toprovide for such adjustment the hub 45 is split at 50 shown in Figs. 2and 3 and one portion of the hub is provided with a plane hole forreceiving a cap screw 51 which is threaded at 52 into the other portionof the hub 45. Hence, by tightening the screw the cam blank support maybe securely connected with the master cam carrying plate 47 in anydesired position. The shaft 31 is drivingl connected with the hub 46 ofthe plate 47 by a key 46a.

The shaft 31 is automatically oscillated by a power operated mechanismdriven by an electric motor 60 attached by screws 61 to the side frame35. The shaft 62 of the motor 60 is connected by coupling 63 with ashaft 64 journalled in a bearing 65 carried by a gear housing cover 66.The cover 66 is attached to a gear housing 67 integral with a bracket 68attached by screws 68a to a cross frame member 69 attached by screws 70to the frame 35 and by screws 71 tothe frame 36. Within the gear housing67 the shaft 64 carries a gear 72 meshing with a gear 73 connected witha shaft 74 journalled in a bearing 75 carried by the gear housing .67.The cross frame 69 provides a ear housing 76, the walls of which provideearings for a shaft 77 which is in alignment with the shaft 74 and isconnectible therewith by a suitable clutch 78. The clutch shown is knownto machine tool makers as the J ohnson clutch and comprises a drivingpart 79 attached by pin 80 to the shaft 74 and carrying an expandibleband 81 adapted to exand against and grip a shell 82 integral with a hub83 attached by pin 84 to the shaft 77. The ends of the band 81 arenotched at 85 to receive cylindrical bearings 86 provided by levers 87having wear pieces 88 respectively. The wear pieces 88 bear against eachother to provide a fulcrum for the levers 87. The ends 87a of the levers87 are wedged apart by a pointed wedge block 89 slidablc in alongitudinal groove 90 in the driving part 79 and attached by screw 91to a shifting sleeve 92 having a groove 93 for receiving lugs 94provided by the arms 95 of a shifting lever 96 which is keyed to a shaft97 journallcd in the lugs 98 which extend from the gear housing 67. Theshaft 97 carries a lever 99 urged in a counterclockwise direction asviewed in Fig. 7 by spring 100. When the lever 99 is in the positionshown in Fig. 7 the shaft 74 is disconnected from the shaft 77 Toconnect the shaft 74 with the shaft 77 the shifting sleeve 92 is movedtoward the left as viewed in Fig. 7 by a suitable pedal (not shown)connected by a rod 101 with the lever 99. When the rod 101 is moveddownwardly by the pedal the lever 99 will move clockwise to cause thesleeve 92 to move toward the left. When this occurs the wedge block 89will be moved between the levers 87 to wedgetheir ends 87a apart therebycausing the ends of the band 81 to be separated and the band to beexpanded within the shell 82 and to grip the shell and thus cause theshaft 74 to be drivingly connected with the shaft 77. The lever 99 isheld in clutch engaging position by a latch mechanism to be describedlater.

Within the gear housing 76 provided by the cross frame member 69, theshaft 77 carries a worm 110 meshing with a worm gear 111 keyed at 112 toa shaft 113 journalled in bearings 114 carried by a tubular extension115 of the gear housing 76. The upper end of the shaft 113 is drivinglyconnected with a cam plate 116 provided with cam races 117 and 118 asshown in Figs. 8 and 10. The

' upper cam race 118 receives a roller 119 journalled on a pin 120attached to a segment 121 the hub of which is provided with a bearing122 journalled on a stud 123 integral with a bracket 124 secured byscrews 125 to the cross frame member 34. The hub of the segment 121 isretained by a plate 126'secured by a screw 127 to the stud 123. Thesegment 121 meshes with a gear 128 attached by a key 129 to the lowerend of the shaft 31. The cam 118 is rotated in a clockwise direction asviewed in Fig. 10, and in making one complete revolution it causes thesegment 121 to make two complete oscillations. That part of the race 118between the radial lines a-a and bb in Fig. 10 cooperates with theroller 119 in a manner such that the segment 121 will be caused to swingrelatively gradually toward the right as viewed in Fig. 10 during thefirst part of the first oscillation. This movement of segment 121produces arelatively slow counter-clockwise movement of the cam blank 20as viewed in Fig. 1. Hence, the work done upon the cam blank 20 asdescribed with reference to Figs. 1 and 2 will take place relativelyslowly during the first swing of the segment 121 from home position.This swing will be followed by a relatively rapid swing in the oppositedirection due to the fact that the cam race 118 is steeper between theradial lines bb and 0-0. The cam.118 is also relatively steep betweenthe radial lines c-c and ddT and between d(l and 0-0. Hence, it isapparcut that the first and relatively gradual swing of the segment 121will be followed by three relatively rapid swings. Hence, the firstabrasion of the work will be relatively slow but will be followed bythree relatively rapid passes which provide for finished or smoothing ohthe camming edges of the cam plate 20. For a purpose to bedescribed,'the race 118 is constructed so that between the radial lines6-6 and aa there will be no movement of the segment 121.

The cam 116 will stop rotating after making one complete revolution.This is accomplished by providing the cam plate 116 with a lug 140 whichat the end of the cycle of movement of the cam 118 moves into engagementwith a lever 141 pivoted on a rod 142 supported by a bifurcated bracket143 attached by screws 144 to the cross frame member 69. As the lefthand end of the lever 141 moves downwardly the right hand end movesupwardly to engage a lug 145 provided by a lever 146 pivoted on a pin147 carried by bracket 148 attached by screws 149 to the gear housing67. A spring 150 attached to the left hand end of the lever 146 urgessaid lever in a downward direction so that when the lever 141 is notengaged by the lug 140 a stop member 151 provided by the lever 146 willbe permitted to engage a latch lever 152 integral with the clutchshifting lever 96. It is, therefore, apparent that the machine isstarted into operation by moving the rod 101 downwardly as explainedbefore in order to connect the shaft 74 with the shaft 77. The operatorholds the rod 101 in downward position until the cam 116 has beenrotated sufliciently that its lug 140 will be out of engagement with thelever 141. When this occurs the spring150 will be permitted to move thelever 146 into such position that the stop 151 will engage the latchlever 152 and hold it in such position that the clutch will remainengaged so that the operator may release the pedal which was used tomove the rod 101 downwardly. Obviously, after the cam 116 has made onecomplete revolution the lug 140 will engage the lever 141 causing it tomove counterclockwise as viewed in Fig. 7' thereby causing the lever 146to move clockwise and its stop 151 to be moved away from the lever 152whereupon the spring 100 is permitted to inove the lever 99counterclockwise and to cause the clutch to be disengaged as statedbefore.

It has been stated that the cam 48 controls the axial movements of thegrinding wheel with relation to the rotary movement of the cam blank 20.As each of the grinding Wheels 28 and 28a is supported and controlled inthe same manner, one description of the support and control of thegrinding wheel 28 will serve to explain the support and control of thegrinding wheel 28a. The parts pertaining to the grinding wheel 28a havebeen given reference numbers corresponding to similar parts pertainingto the grinding wheel 28 but the letter a is aflixed to referencenumerals referring to parts pertaining to the grinding wheel 28a.

The frames 35 and 36 support a table 160 attached by screws 161. Thetable 160 supports a spindle frame carriage guide bracket 162 secured byscrews 163 and providing in conjunction with a gib 164 parallel wayswhich receive the dove-tail shaped extension 165 of a spindle framecarriage 166 to which screws 167 secure a spindle frame 168 having asplit cylindrical portion 169 which may be clamped around the spindlebearing 170 providing a journal for a spindle 171 which supports anddrives the wheel 28. By tightening clamping screws 172 the bearing 170is secured to the frame 169. The bracket 168 includes a second splitcylindrical portion 173 which by tightening a clamping screw 174 willretain a bearing 175 for the right hand end of the spindle 171. Spindle171 carries a pulley 17 6 located between the cylindrical portions 169and 173 of the frame 168. The pulley 176 is driven by a belt 177 whichpasses around a pulley 178 driven by an electric motor 179 mounted uponthe frame 36.

As seen in Fig. 5 the carriage 166 provides a nut portion 180 whichreceives a screw 181 provided by a rod 182 journalled in a bearing 183provided by a bracket 184 attached by screws 185 to the table 160. Therod 182 may be operated manually by hand wheel 186. The left hand endportion 187 of the rod 182 bears against a cam following slide 188engaging the cam 48. The slide 188 is guided by parallel ways providedby a bracket 189 and a gib 190 held down upon the bracket by screws 191and adjusted laterally by screws 192 passing horizontally through thebracket 189. Bracket 189 is secured to the table 160 by screws 193. Thecarriage 166 is urged toward the cam 48 by a spring 194 located betweenthe carriage and the bracket 184. This spring 194 maintains the rod 187in engage-- ment with the follower 188 and the follower 188 inengagement with the cam 48. At 480 the cam 48 is provided with a surfaceso located as to maintain the wheel 28 as indicated in full lines inFig. 1. As the cam 48 is turned in a counterclockwise direction itsbeveled surface 48b will permit a movement of the follower 188 rapidlytoward the axis of the cam 48 thus permitting the grinding edge 27 ofthe wheel 28 to move to the dot and dash line po ition 27 shown inFig. 1. Between the points 480 and 48/1 the cam 48 is so shaped thatduring further counterclockwise rotation of the cam the grinding wheeledge will move gradually from the position indicated at 27 in Fig. 1toward the full line position 27 in order that the desired cam contour26 will be generated upon the blank 20.

After each grinding operation the wheel 28 is dressed off by a diamond1190 mounted in a suitable holder 1191 detachably secured, to a frame1192 which has a clamping hub 1193 by which the frame is clamped to a.shaft 1194 mounted in brackets 195 and 196 which are integral with thecross frame 34. The shaft 1194 is also journalled in a bracket 197attached to the frame 36. The frame 1192 is provided with a lever 198connected by a pin 199 with a bifurcated pivot member 200 connected bypin 201 with a clevis 202 attached by a rod 203 with a clevis 204connected by a pin 205 with a lever 206 which is, attached to the upperend of a shaft 207 extending vertically through the bottom of the crossframe 34 and journalled in a bearmg bracket 208 attached by screws 209to member 34. The lower end of the shaft 207 is connected by a key 210to a lever 211 comprising horizontal portions 212 and 213 and anintermediate portion 214 which permits the lever to straddle the camplate 116. The

lever portion 213 carries a screw pin 215 providing a journal for aroller 216 which is received by the cam race 117. The race 117 is soshaped between the radial lines ce and aa that, while the segment 121and hence the work is at rest, the lever 211 will be given one completeoscillation which will cause the frame 1192 to oscillate and cause thediamond 1190 to move over the face 27 of the grinding wheel 28.

The grinding wheel 28 is provided with a cover 220 which isautomatically removed from position shown in the drawings while thediamond 1190 is dressing the wheel 28. The cover 220 is mounted upon alever arm 221 pivotally connected by pivot screw 222 with a bracket 223attached by screws 224 to a flange 225 of the table 160. The lever 221is connected by a rod 226 with a lever 227 connected with the shaft1194. It is, therefore, apparent that as the frame 1192 swings towardthe grinding wheel 28 the cover 220 will be moved away from the face ofthe grinding wheel so as to permit the diamond to move withoutinterference by the cover.

After each operation of dressing the grindmg wheel it must be fedautomatically toward the work spindle 31 to compensate for the amount ofgrinding material removed by the diamond 1190. The automatic feeding ofthe wheel 28 axially toward the work is accomplished by mechanism shownmore clearly by Figs. 16 and 17. The rod 182 which carries the carriagefeed screw 181 is provided with a slot 230 which receives a pin 231connected with the hub 232 of a ratchet The ratchet 233 is engaged bypawls 234 each nivotally supported upon a pivot screw 235 threaded intoa pawl supporting arm 236 having a hub 237 loosely journalled upon thehub 232 of the ratchet 233. Each pawl 234 is urged against the ratchet233 by a spring 238 having one end connected with the pawl 234 and theother with a spring post 239 attached to the pawl lever 236. The lever236 is urged in a counterclockwise direction by spring 240 retainedwithin a recess 241 pro vided by a bracket 242 attached by screws 243 tothe table 160. One end of the spring 240 bears against a screw 244threaded into the bracket 242 and the other end of the spring bearsagainst a plunger 245 which engages the lever 236. Lever 236 is moved ina clockwise direction as viewed in Fig. 16 by rod 250 guided by abracket 251 secured-by a screw 252 to the bracket 162. Adjacent itsright hand end the rod 250 is provided with a recess 253 for receivingthe cylindrical end 254 of a lever 255 which is integral with a frictionclutch member 256 loosely mounted on the shaft 1194 and urged by aspring 257 against a friction disc 258 (see Figs. 13 and 15). The disc258 is provided centrally with notches 259 by which it is is drivinglyconnected with lugs 260 extending from the plate 261 drivingly connectedwith the shaft 1194. The spring 257 is maintained in a state ofcompression by nuts 262 engaging the threaded extension 263 of the shaft1194.

hen the shaft 1194 is oscillated in. the manner described, the lever 255will oscillate but only to the extent determined by two set screws 270and 271 which respectively limit the upward and downward movements of alever 272 integral with the clutch memher 256. As shown in Fig. 16 theupper side of lever 272 is engaged by the lower end of screw 27 0 andthe lower side of the bifurcated extension of lever 272 is engaged by ashoulder 273 provided by the screw 271. The screws 27 0 and 271 arethreadedly connected with the table 160. By adjusting these screws theextent of travel of the rod 250 may be varied in order to vary thetravel of the ratchet 233 and hence of the screw 181 which controls theposition of the grinding wheel spindle carriage 166 along the table 160.

The carriage 166 is fed automatically onlyin a direction toward thework. When it is desired to retract the carriage 166 this isaccomplished by turning the hand wheel 186. In order to permit turningthe hand wheel in a direction to retract the carriage 166 the )tLWlS 234must be disengaged from the ratchet 233. This is accomplished by movinga handle 280 toward the spindle carriage 166 as seen in Fig. 16. Thehandle 280 is connected with an L-shaped rod 281 which is slidablyguided by the bracket 251 and has an end portion 282 adapted to engagethe pawl 234 nearest to it and to thereby cause this pawl to move theother pawls 234 away from the ratchet 233. The rod 281 is maintained inthe position shown in Fig. 16 by spring 283 and is retained in positionfor disengaging the pawls from the ratchet by a spring clip 284 shown inFigs. 16' and 3, said clip being attached by screws 285 to the bracket162 which is provided with a slot 286 through which the rod 281 extends.The handle 280 is used particularly when the grinding wheels arereplaced. As the wheels are worn away their thickness decreasesrequiring them to be automatically fed toward the work. When the wheelshave been worn away to such an extent that they can no longer be used itis necessary to replace them with new wheels. This necessitates locatingthe wheel spindle carriages at distances more remote from the work. Asstated before in order to accomplish this by rotating the hand wheels186 it is necessary to move the handle 280 toward the work carriage 166so that the ratchet 233 will turn free of the pawls 234.

The cross frame 34 supports brackets 290 one of which is shown in Fig. 8which support a splash guard 291 which catches the liquid directed uponthe grinding wheels for lubricating and cooling the same. The nozzlesfor directing the lubricant upon the work are not shown as they form nopart of the present invention. The guard 291 provides an annular flange292 (see Fig. 2) surrounding a central orifice through which thegrinding liquid may pass to an annular groove 293 provided by the camsupporting plate 47. Tubes 294 direct the liquid into an annular chamber295 providcd by the frame 34, said chamber being connected with a drainpipe 296.

While the form of embodiment of the present invention as hereindisclosed, constitutes a preferred form, it is to be understood thatother forms might be adopted, all coming within the scope of the claimswhich follow. 7

What is claimed is as follows:

1. Grinding apparatus for shaping the contour of fiat plates comprising,in combination, a work-ho1der supportin a flat plate for rotation on anaxis at rig t angles to its plane; a grinding wheel having a planesurface for grinding the contour of the plate, said wheel rotating on anaxis arallel to the plane of the plate; and means "or concurrentlyrotating the work-holder and bodily moving the wheel.

2. Grinding apparatus for shaping the contour of flat plates comprising,in combination, a work-holder supporting a fiat plate for rotation on anaxis at right angles to its lane; a grinding wheel having a plane sur.ace for grinding the contour of the plate, said wheel rotating on anaxis arallel to the plane of the plate; and means or concurrentlyrotating the work-holder and axially moving the wheel.

3. Apparatus according to claim 2 having means for automatically sto pinrotation of the support atter one eye e 0 movement thereof.

4. Apparatus according to claim 2 having means for automaticallystopping rotation of the support after one cycle of movement thereof andmeans for automatically dressing and feeding the grinding wheel.

5. Apparatus according to claim 2 having means for automaticallydressing the grinding wheel between grinding operations and feeding thewheel to compensate for the grinding material removed.

6. Grinding apparatus for shaping the contour of a flat platecomprising, in combination, a shaft, a work support carried by saidshaft and supporting the fiat plate for rotation about an axis at rightangles to its plane, a grinding wheel rotatable on an axis parallel tothe plane of the plate and having a plane grinding surface engaging theedge of the plate, a movable frame for the wheel, a master cam carriedby said shalt, a cam follower connected with the grinding wheel frameand cooperating with the cam, and means for oscillating the shaft whilethe wheel engages the plate.

7. Grinding apparatus for shaping the contour of a flat platecomprising, in combination, a shaft, a work support carried by saidshaft and supporting the flat plate for rotation about an axis at rightangles to its plane, a grindin wheel rotatable on an axis parallel tothe plane of the plate and having a plane grinding surface engaging theedge of the plate, a grinding w ieel frame guided for bodily movementaxially of the wheel, a master cam carried by said shaft, a cam followerconnected with the grinding wheel frame and cooperating with the cam,and

\ means for oscillating the shaft while the wheel engages the plate.

8. Grinding apparatus for shaping the contour of cams comprising, arotatable cam blank support, a grinding wheel rotatable on an axistransverse to the axis of the support, and cam means for automaticallyrotating the support and concurrently moving the grinding wheel bodilywhile the wheel engages the blank.

9. Grinding apparatus for shaping the contour ct cams comprising, arotatable cam blank support, a grinding wheel rotatable on an axistransverse to the axis of the support, and a plurality of cams forautomatically rotating the support and concurrently moving the grindingwheel bodily while the wheel engages the blank.

10. Grinding apparatus for shaping the contour of cams comprising arotatable cam blank support, a plurality oi grinding wheels rotatable onaxes transverse to the axis of the support, a cam for rotating saidsupport and another cam for concurrently moving the grinding wheelsbodily while said wheels engage the cam blank.

11. Grinding apparatus for shaping the contour of cams comprising, arotatable cam blank support, a plurality of grinding wheels rotatable onaxes transverse to the axis of the support, means for rotating saidsupport, and

neeaom a cam on said support for concurrently moving said grindingwheels axially at a predetermined rate relative to the speed of rotationof the support while the wheel engages the cam blank.

12. Grinding apparatus for shaping the contour of cams comprising, arotatable cam blank support, a plurality of grindin wheels rotatable onaxes transverse to the axis of the support, a cam for automaticallyrotating said support and another cam for simultaneously moving all ofsaid grinding wheels axially at a predetermined rate relative to thespeed of rotation of the support while the wheel engages the cam blank.

13. Grinding apparatus for shaping the contour of cams comprising anoscillatable cam blank support, a grinding wheel rotatable on an axistransverse to the axis of the support, and means for oscillating thesupport and concurrently reciprocating the grinding wheel on its axiswhile the wheel engages the cam blank, said means comprising a pluralityof cams.

l4. Grinding apparatus for shaping the contour of cams comprising, anoscillatable cam blank support, a grinding wheel rotatable on an axistransverse to the axis of the support, a plurality of cams foroscillating the support and concurrently reciprocating the grindingwheel on its axis while the Wheel engages the cam blank, said cams beingso designed that a plurality of oscillations of the cam blank andreciprocations of the grinding wheel are efiected during the cycle ofoperation of the cams.

l5. Grinding apparatus for shaping the.

contour of cams comprising, an oscillatable cam blank support, agrinding wheel rotatable on an axis transverse to the axis of thesupport, a plurality of cams for oscillating the support andconcurrently reciprocating the grinding wheel on its axis a plurality oftimes during one cycle of operation of the cams and while the wheelengages the cam blank, said cams being so designed that a relativelyslow movement of the cam blank support and grinding wheel is followed bya relatively rapid movement thereof.

16. Grinding apparatus for shaping the contour of a fiat platecomprising, in combination, a shaft; a work support carried by saidshaft and supporting the fiat plate fdr rotation about an axis at rightangles to its plane; a grinding wheel rotatable on an axis parallel tothe plane of the plate and having a plane grinding surface engaging theedge of the plate; a grinding wheel frame guided for bodily movementaxially of the wheel; a master cam carried by said shaft; a. camfollower connected with the grinding wheel frame and cooperating withthe cam; means for oscillating the shaft while the Wheel engages theplate; and means for automatically 7 parallel to the plane of the plateand having a plane grinding surface engaging the edge of the plate; agrinding wheel frame guided for bodily movement axially of the wheel, amaster cam carried by said shaft; a cam follower connected With thegrinding wheel frame and cooperating with the cam; means for oscillatingthe shaft While the wheel engages the pl-ate; means for automaticallystopping rotation of the work support after one cycle of movementthereof and means for automatically dressing the grinding wheel betweengrinding operations and feeding the wheel to compensate for the grindingmaterial removed.

18. Grinding apparatus for shaping the contour of a flat platecomprising, in combi nation, a shaft; 2. work support carried by saidshaft and supporting the fiat plate for retation about an axis at rightangles to its plane; a grinding wheel rotatable on an axis parallel tothe plane of the plate and having a plane grinding surface engaging theedge of the plate; a grinding wheel frame guided for bodily movementaxially-of the Wheel; a master cam carried by said shaft; a cam followerconnected. with the grinding wheel frame and cooperating with the cam;means for oscillating the shaft while the wheel engages the plate; andmeans for automatically dressing the grinding wheel between grindingoperations and feeding the wheel to compensate for the grinding materialremoved.

19. In a grinding apparatus the combination of a grinding wheel; adresser; a wheel guard; means for moving the dresser against the wheelfor removing the guard from the path of the dresser. Y

20. In a grinding apparatus the combination of a grinding wheel; adresser; a wheel guard; means effecting relative. movement between thegrinding wheel and the dresser and for removing the guard from the pointof en gagement of the dresser with the grinding wheel.

21'. In a grinding apparatus the combination of a grinding wheel; ashaft; a dresser pivotally mounted on the shaft; a movable wheel guard;driving connections between the wheel guard and the shaft; and means forrocking said shaft so as to move the dresser toward and past the wheeland causing the wheel guard to remove from the path of the dresserthrough the said driving connect-ions.

22. In a grinding apparatus the combination of a work support; a shaftrotating the work support; a cam on said shaft; a rotary grinding wheel;a bodily movable frame supporting said wheel; a cam follower cooperatingwith said'cam and adjustahly connected to the frame; cam operated meansfor operating the cam shaft; and asecond cam operated means foradjusting the frame with respect to the cam follower. v

23. In a griding apparatus the combination of a shaft; a work support onsaid shaft;

a cam on said shaft; a rotary grinding wheel; a bodily movable framesupporting said wheel; a cam follower cooperating with the said cam andadjustably connected to the frame; cam operated means for operating thecam shaft; and a second cam operated means for adjusting the frame withrespect to the cam follower.

24. In a grinding apparatus the combination of a shaft; a work supporton the shaft; a master cam on the shaft; a rotary grinding wheel; abodily movable frame supporting said wheel; a master cam followeradjustably connnected to the frame cam operated means for operating themaster cam shaft; a dresser for the grinding wheel and a second camoperated means for adjusting the frame with respect to the mastercamfollower and for operating the dresser.

25. In a grinding apparatus the combination of a shaft; a work supporton the shaft; a master cam on the shaft; a rotary grinding wheel; a.bodily movable frame supporting said wheel; a master cam followeradjustably connected to the frame; cam operated means for operating themaster cam shaft; a dresser for the grinding wheel surface; a movablewheel guard; and a second cam operated means for adjusting the framewith respect to the master cam follower and for operating the dresserand removing the guard from the path of the dresser.

26. In a grinding apparatus the combination of a shaft; :1 work supporton the shaft; a master cam on the shaft; a rotary grinding wheel; abodily movable frame supporting said wheel; a master cam followeradjustably connected to the frame a second shaft coaxial with the mastercam shaft; cam operated means on the second shaft for operating themaster cam shaft; and another cam operated means on the second shaft foradjusting the frame with respect to the master cam follower.

27. In a grinding apparatus the combina tion of a shaft; a work supporton the shaft; a master cam on the shaft; a rotary grinding Wheel; abodily movable frame supporting said wheel; a master cam followeradjustably connected to the frame; a second shaft coaxial with themaster cam shaft; cam operated means on the second shaft for operatingthe master cam shaft; :1 dresser for the grinding wheel surface; meansfor adjusting the frame with respect to the master cam follower; a thirdshaft transverse to the master i cam shaft operating the dresser and thelast said means; and another cam operated means on the second shaft foractuating the third shaft.

28. In a grinding apparatus the combination of a shaft; a work supporton the shaft; a master cam on the shaft; a rotary grinding wheel; abodily movable frame supporting said wheel; a master cam followeradjustably connected to the frame a second shaft coaxial with the mastercam shaft; cam operated means on the second shaft for operating themaster cam shaft; a dresser for the grind ing wheel surface; a movablewheel guard; means for adjusting the frame with respect to the mastercam follower; a third shaft transverse to the master cam shaft operatingthe dresser and the last said means and removing the wheel guard fromthe path of the dresser; and another cam operated means on the secondshaft for actuating the third shaft.

29. in a grinding machine the combination of a grinding wheel rotatingat constant speed; a worlrholder movably supporting a workpiece; meansfor oscillating the word"- piece and bodily moving the grinding wheelwhile it engages the workpiece; said means ellecting a plurality ofoscillations at varying rates of speed.

30. in a grinding machine the combination of a grindin wheel rotating atconstant speed; a worliholder movably supporting a workpiece; means foroscillating the workpiece and axially moving the grinding wheel when itsplane side face engages the worlr.

31. In a grinding machine the combina tion of a grinding wheel rotatingat constant speed; a shaft carrying a workpiece; a master cam alsocarried by said shaft; a cam :Eollower controlling bodily movements ofthe grinding wheel; an actuating means which oscillates the shaft aplurality of times at varying rates of speed while the grinding wheelengages the work.

32. In a, grinding machine the combination of a support for supporting aworkpiece; a grinding wheel; a movable frame carrying the grinding wheela master cam controlling the movement of the frame; a shaft; means onsaid shaft for bodily moving the minding wheel frame relative to themaster cam in response to rotation of the shaft; a hand wheel on saidshaft for manually turning the same; ratchet mechanism tor turning theshaft between grinding operations; said ratchet mechanism normallyresisting rotation of the shaft in one direction b the hand wheel; andmeans for disabling t e ratchet mechanism.

33. In a grinding machine the combination of a support for supporting aworkpiece; a grinding wheel; a movable frame can ing the grinding wheel;a master cam contro ling the movement of the frame; a shaft; means onsaid shaft for bodily moving the grinding wheel frame relative to themaster cam in response to rotation of the shaft; a hand wheel on saidshaft for manually turning the same; a member having an overtravel foroperating the ratchet mechanism; yielding means for imparting motion ofthe member to' the ratchet mechanism and at least one adjustable stopfor varying the movement imparted by the yielding means to the ratchetmechanism.

34. In a grinding machine the combination of a support for supporting aworkpiece; a grinding wheel; a movable frame carrying the grindingwheel; a master cam controlling the movement of the frame; a shaft;means on said shaft for bodily moving the grinding wheel frame relativeto the master cam in response to rotation of the shaft; a hand wheel onsaid shaft for manually turning the same; a member having an overtravelfor operating the ratchet mechanism; a friction disc imparting motion ofthe member to the ratchet means; and at least one adjustable stop forvarying the movement of the friction disc.

35. in a grinding apparatus for grinding opposite edges of a plate thecombination of a work support pivotally supporting a plate at anintermediate point; grinding wheels operatin "with their plane surfaceon op- 'oosite edges of the plate; a master cam for bodily moving thegrinding wheels while they engage the edges of the plate; and anothercam for moving the plate about an intermediate point and controllingmove- 1 meat of the master cam.

36. in a grinding apparatus for grinding opposite edges of a plate thecombination of worl: support pivotally supporting a plate at anintermediate point; grinding .heels operatin with their plans surface onopposite e ges of the plate; a master cam for axially moving thegrinding wheels while the same engage the edges of the plate; andanother cam for moving the plate about an intermediate point andcontrolling movement of the master came 37. In a; grinding apparatus forgrinding opposite edges of a plate the combination of a worlr supportpivotally supporting a plate at an intermediate point; grindin wheelssimultaneously operating with their plane S111- face engaging oppositeedges of the plate; a shaft; a. master cam for anially moving thegrindin wheels while the same engage-the edges 0 the plate; and anothercam for moving the late about an intermediate point and controllingmovement of the master cam.

88. In a grinding apparatus for grinding opposite edges of a late onopposite sides of its center, the com ination of a work support forsupporting a plate for rotation about an axis normal to the plane of theplate; grinding wheels operating with their plane surface on oppositeedges of the plate and lilon opposite sides of the center thereof; a

shaft car g the support; and a cam on said shaft for odily movin thegrinding wheels while the same engage tie edges of the plate; 5 andmeans for rotating the shaft.

39. In a grinding apparatus for grinding opposite edges of a. plate onopposite sides of its center the combination of a work support forsupporting a, plate for rotation about an 10 axis normal to the plane ofthe plate; grinding wheels operating with their plane surface onopposite edges of the plate and on opposite sides of the center thereof;a master cam rotating coaxially with the support; and means 15cooperating with the cam for axially moving the grinding wheels whilethey engage the edges of the plate.

In testimony whereof we hereto afiix our signatures. LOUIS G. GOAD. LEOC. SHIPPY.

